"If you check the box to enable the restricted driver and reboot, it should work."

If I check the the box in "resricted manager" the line

DISABLED_MODULES="fglrx"

in etc/default/linux-restricted-modules-common is changed back to

DISABLED_MODULES=""

I leaved it unchecked now.

So my "restricted manager" reports for the ATI driver
activated: no in use: yes

EDIT (subvertigo): doesn't work for me... then I solved removing the surrounding IF statement in the ati-module-fix ! Now it works!
Can you explain me how find gdm sequence number (i don't know what it is).

Updated some information only applicable for Gutsy

I've updated some minor details about the fglrx-installation in Gutsy:

By default, Gutsy (and Feisty too) now have Universe and Multiverse enabled

The fglrx-version in Gutsy's linux-restricted-modules is 8.37.6 and not 8.28.8

Note: I don't really know what this actually does in the context of a desired installation, so try at your own risk. I assume this being installed from my earlier Feisty installation where I tried out compiz and AIGLX was not supported by the driver.

After removing the xserver-xgl package, all problems described above vanished.

Maybe someone with more detailed knowledge might find it useful to add a paragraph to the page.

Comment: I had a lot of trouble until I found your solution. Removing xserver-xgl made most of the graphical artifacts disappear (I still have some black bars in the bottom right corner of one screen), and made my dual screen setup work again. Should this be in the general guide?

Comment: I was seeing some very similar behavior after following this tutorial. glxgears would cause gdm to crash and the artifacts were left on the screen. The system would also be dog slow, moving windows was very laggy. Removing xserver-xgl did the trick for me!

Any Ideas? It did work before (on feisty, using older drivers)!! Help!! --212.62.64.34 14:08, 22 November 2007 (CST)

NEW (by subvertigo):
I have the same identical problem (identical logs). Before with Feisty+8.43.2 or Gutsy+8.43.2 i had no problems... :-(
My pc is a Dell Inspiron 6400 with ATI X1400.
fglrinfo reports using Mesa drivers.

I tried to add or remove "fglrx" from /etc/default/linux-restricted-modules-common and it has no effects. The "restricted manager" signals that ati driver is not in use when fglrx is blacklisted. I don't understand if it have to be blacklisted or not.